java_note.txt

The single most important change in Java 8 enables 

Advantages :
Faster, clearer coding and opens the door to functional programming. 
Functional programming has risen in importance because it is well suited for concurrent and event-driven (or "reactive") programming. 
Collection libraries can be given powerful APIs if the language has a convenient syntax for functional expressions

lamda exp : anonymous function impl
functional Interface : only one abstract method	

Can functional interface be extended ?   YES

Lamda expression chaining

inteface vs abstract class (abstract class has a constructor and its use?)

What is the point of public default method in  functional interface


Defender methods in interfaces :

Before java 1.8 if you need to add new functionality into interfaces one needs to provide its implementation in all of the concrete class which are implementing that interface.
and this limitation makes it almost impossible to extend/improve the existing interfaces and APIs


The same challenge was faced while enhancing the Collections API in Java 8 to support lambda expressions in the API. 
To overcome this limitation a new concept is introduced in Java 8 called default methods which is also referred to as Defender Methods or Virtual extension methods.




REST : Representational State Transfer ?????

Rest + Spring


Rest vs servlet vs srping mvc

restful webservice to return employee data in different formats
Add caching + authentication
pass object in request and get response as object